In Massachusetts over the weekend, Cruz argued "JFK would be a Republican today," because he supported tax cuts.

Here's the impression:

Both John F. Kennedy and Robert F. Kennedy actually used the line — John in Ireland and Bobby in a speech at the University of Kansas — quoting George Bernard Shaw.

"This is an extraordinary country," John F. Kennedy said. "George Bernard Shaw, speaking as an Irishman, summed up an approach to life: Other people, he said "see things and...say 'Why?' ...But I dream things that never were — and I say: 'Why not?'"

Said Robert Kennedy in the 1968 speech, "George Bernard Shaw once wrote, 'Some people see things as they are and say why? I dream things that never were and say, why not?'"